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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78c3c7c78f3c82e439ac3366174cab0c614f929333487a1342b4e7edf4e852f1' 
  AND token = '636Bo0h2xoG/ikiZawWiqqQuUVkXDQv1R/zyDh1I+d8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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