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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '302705d3fda13784593f9b3c0461d9e6a3e1df791af329c298c0cf3b92173545' 
  AND token = 'a0APE7TeHkYqWb7TZRtpnS9txv3R1i/X2SIiLZbqrZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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