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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a12523d7d27cd2d11678c9b7c329989dc03fb5caf62a35f9b574b33b55688a03' 
  AND token = 'yH8/SorOpNamd9U7MDJKeNQsJKOR+OJw8wdVFuk/h0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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