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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3ff3eeaa616a165b72fb91cbe13a6157f51d246feb60ef3e6392fb84f56fff3' 
  AND token = 'Tewb5gjBnOrweg+H92y5Nck19x43kLKbyxfRz8P/v+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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