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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '829f34951aa983c54ab6aa52a14af4de9e161c04b0c03084a7cd4e456e9aa245' 
  AND token = '0XWVVX5tv1uoS/qAtUGpulSyqf0Al2biT3EexEECYT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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