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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a84a71b7e1cc72ffd4cb60bb2b44f9f4a093952b90ef3ddc2a463704f39465f' 
  AND token = 'ajuFbO9HhrG9L67HEKigVjft1A5jmCBwRrTZM45WadE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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