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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cd3789ea1be48b1b1da7da4eeef5e1db3c451d1da73b6f63b331653697e5e26' 
  AND token = '0heHKzPjwLI18Fcr64RZgu/qac5A/XxJS3q8UbgRdDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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