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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4aaf04404b65398a40271a647f69627262d72aab5b9162472eb22f1fe34143c5' 
  AND token = '9HVCI0cEc3zbALUllVWCgUBXljLadHUR/8evVgaYSRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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