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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9df90b0d762e7fecc0d72149f4b413969d1537413144da9ff5558dc7b926f27b' 
  AND token = '2h7Da4czI7i5e+MNiTbNxJf8UlNzU68prvobo8azKrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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