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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '557baeeb84dc1f1ebf9a06c7c5ef2913aa682e730f0c9e51cdc81dbd0c2d1e8c' 
  AND token = 'itG34ixuxjnCqTHOtET74T1INLdzZEHxrBe30Rd2ei4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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