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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ec941ed44cba96b9f3c05b77dcb2f2b42335082ac57381ac6359d97fc9f59fc' 
  AND token = 'Lazgrz4lW1lHRjxsHN6/0X9EX6ongUvclfsP5+canWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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