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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54a30978b9489bc82a94ad0371beb38e8c4fe20273b2c7c9277e36c68106f420' 
  AND token = 'pElF6dRWWZ2jRGNgNcXPz+LUfUQgmjmQ5lndnhbI8hU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}