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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db5cb6ee7e6165f6fceea98453f051e7abfbdbb10d9ac29d9261862a6be8809a' 
  AND token = '6llF4apUvfFnAUdOQV2AzgmZdIhZM5vLCP9dsno/hAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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