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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b37b2098d2941e061b6c68cce7ff35102c8c3f74aaa8566348e0861f9845cc8' 
  AND token = 'MfSLzvZ6AFtS4/41Aw9okqs1YK05qE1hVmk2d4Jqdkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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