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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b15f43d7986c9ff8d64686ea8c3d7f7c5a9eb86b67876ac99ab48ea958910a6a' 
  AND token = 'NHY3DMcw9lmu7YX1tNIurXcGmn81jU3qyyGyCHuDDkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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