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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bec0ba8986bf9c75c520213e405aaec257bd1e73e075cd272a5c846b61be1e9c' 
  AND token = 'lyNkEaSHsHLin56HAJF9Tg/F5cqxN6/Fw+9OxCbT2uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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