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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ab62e34d82ef9a4859729c067e9a3e81cba9de87a0dab2ff47ca878ac3fd429' 
  AND token = 'DLS5Xb0GNI8HG2pPw643Mf7ZWgevBHz7oX7XcxqTcKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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