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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '688cf4916da3b61c43164af8d1a2e173b630feac8a880862bd583e757dde07f0' 
  AND token = 'WYmN8oLdPJ1VdfWSkAK8gTNzIA56KZc8dJkWzgGRGVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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