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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1127cf3afbd18cb7827f49bef0b3de3fbdfdc2de7b7484d1cae7323796bc855' 
  AND token = 'A/oMc08gEHGtEdixUojC1EvEL5w1s1Ssykiifw6qeLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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