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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70f3afbfe21a833169f615eb8f469cd10e49be7a4ac86fc53b773f4bb4ea596b' 
  AND token = 'wHy66m71BFLA5Ols5cEf2BHCmzeVHllos5dUf46fUFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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