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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c96b406fa2feefea3019eeef23e236fffb62e0bf5da0d742b2d585ff8ac14776' 
  AND token = 'kkRW+mDZ52T0lfKGe/VPFmtr6UuigOlERXJ5HcMzb58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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