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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bae7b6edc60496b0696ad1727127406681875721a27a9f3f04286ebc2380768' 
  AND token = 'SikUYKZkRl/eQPwjpSNI/Rm2K80E5HzmPSSrb4UVSpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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