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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8900123e9bd875afe3dabd16c70ab710c9c0711060dc624b41b2d2efe525afa' 
  AND token = 'tcpJaWyqCd3SEPNP5GJ5vJpBp+Usd+oAk9kth2oeWL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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