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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e00f7c63302be20025fff550532db510f8e115ca6bae3e4feceec73e23c4e7d4' 
  AND token = '/URc9lqUM5nqtEk9R29gqgXgZQD6/ee8W/6TFVAkiSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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