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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02d3252d0e8b01bee827b5ba64b85ad80263679f264dc92c7c19d755b1dae525' 
  AND token = '4ZycFLLbIBn/8qjGjr0tbySiIe9yR+A+NLac/c96kx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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