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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53dd344d03dc5da7f4495dd65d26313db76524124c277a08a38abd5c617c1012' 
  AND token = 'BHRNReuKGb0XifKYE/2CYkFUbXa3q+v/ScwIxwr8L2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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