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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28492e06113432e5cac56beee7c226109c1a5a12772b550d4b50ea421aea4c12' 
  AND token = '5yGaIzQG/mpwe35FI6y285CXLg9AKgJEOKeW1NnWWX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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