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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '197a296635551234d62e9fc9d2bed182157ca6e81d5f7b8c87e30602492f5bcf' 
  AND token = '48ThU2V7ZlamvYGPnvIwx0PsS0I6PMvs0H664uBDhCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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