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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b17d5e8f2fb471e06a5b3365c3fb55889792eaaf381a595731da57795444aad0' 
  AND token = 'gFJeEyMlpocJSikYOuSzCELyyupOfK0xfsyjetYkHIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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