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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbbebfeb19a447100414cbe30bbd7b0bb9b8e4ec958c6558cf724d0e55a8756e' 
  AND token = '8KKQBfhIz7BD20tzK63GPn4zYLKoDgABeKiV+tTc6C4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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