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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5cc97597934212dc668e0515cfbaafbc30d4dc3caa6f3e0a78db743592c222f' 
  AND token = '0WY7uG2zN338v3bx1AuJHlU9GCQAmgMjECembYelCxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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