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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92f11a5bdbe919186b34b7797df3ab26a750a84cb5e7e5d1bb471cb881c51127' 
  AND token = '9ByRQdRGsvFufW9K6u1iDu5ZLWJZytWDbcPVG1eLAT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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