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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9da8825debb4fb115564383c56a7d74a8ed7ebd35762e1209ea9aa5fdc5f3fe' 
  AND token = 'jXYdav2o5fy/89i6/lqeNgQsC6DzcjFMZST2x8FrvLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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