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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f39c50b9e29e0bbd9d8bc8556702863cd66c753580c274bda9447a6fc87681ad' 
  AND token = 'WKEbm6YHxZLlMmMboTlxI0NZKedfNTm0msfUL8bhBYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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