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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bb01db267fe5c4337d5c7976d5ab988de5e880095bd12ec4c159cbc9a7e259e' 
  AND token = 'rgbX+xbBxM0J7GazfRv9UEA/rCZwc35EiOOkBSjrHAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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