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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0ebe6e2d0e82d0cdbdb0e7ed35a607c765ce1e189858e0b09daf67b0cdce911' 
  AND token = 'PVrvrK1pccxFc2bZ2U59yA1X/FKnCd5ResYu6bL7AvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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