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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b298e899131e80fbcf6194719bbb21fea499b384013e9fd9f5da45752e469390' 
  AND token = '/dR3IVOcy02LIwGotz+3xtxddlxCwjIHy77bb4Y07u8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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