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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ddb2de570acdd077877ee0b248b10a1ea9fad8c157a11733518a23f19a72bdf' 
  AND token = 'OMehKOuhc5901u+2GR2125wQWZ4oEaaWNDFXSG0kHJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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