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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71e1a46128a0c3d2d899dadcdbf36d5f510e9f9418125aa340927b88d820ef21' 
  AND token = 'd5KSLlzdBYhKSQ0XK2Oc3GpmTi6m8r9Lp5kQWYcp39o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00149

JSON explain

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