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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c7bfd1dedf25626e0d029cdd75655fc20329b355a0580bdc236a0e0b070eaec' 
  AND token = '1q0cR/DqA57xkkTogrznDwrvdS4e/Jn6ziqKmmIx64o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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