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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb9655fd58887809cbf4995335477b22a71310a61e6c15e318b06cdd1456fb21' 
  AND token = 'fq8j0exxYZwWANmQ7FA13qkMGeBxhh2++1LpcKy0QfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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