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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '267451b0771e61e054f34c9d50bec1458f64575d63fae7b06945e2faf144eb9d' 
  AND token = 'Z7AbZ60fPBIdaxdzXspgXgbREc2iFLfu8AVbA9UMzrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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