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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cd6f248f207a7180421e5cb2ee7a7e287cad52d7b21ba35ccb2e69aef4f4c9a' 
  AND token = 'v6ToWUfuRpWqCSFic0KRYSwJmbuO7js07y1Bbe6eG4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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