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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14ee85cc08d45d62ab99447edd1ba1f436d2a0b41d26e0aad36f741086300845' 
  AND token = '1UWoMyUuk0zoFLKgjjyjwPID5uZ1otLQ7D+iX8Twwu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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