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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4dc8b2460dbc4ef8b4685d34690ff673d61eebdf7542a9fc64028c0d3e2668f' 
  AND token = 'Jy7P+Gxkj7AGtHjIitRLQqA0Z5ziGCASJ+MirepgUk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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