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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd08ebcf5ab5eff926449805e14feac97da318434ce918f0f4dab5066b854833' 
  AND token = 'wo08KQqLH6jer5Uk+yyltVSESgq985BC5zWB9NLU3k8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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