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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae826a0c9ec919ca5cba727f1ca2f9717cc52603707d8df106f4174a08069a5f' 
  AND token = 'kEGTq0LKqocva7QAwHRanqsy6JzZJga7YsrnZm9/DF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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