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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b96c91a08c924495ba5609d3eb6d2d2283dd9f2de75e519e070529cbcf192236' 
  AND token = 'qP8Uy9VQIokqp2/cypLETXjMwuIuD3GyjUIPdBctPFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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