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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5031beceeefca3325cf02a0f0739f674eb7786f67030aa72d577d5f0027014c' 
  AND token = '8bN3H7zjpiZkj+ym6tK9sM15jQK155IFpEC3/6ZUl+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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