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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebb21a23d9310ca21bdba6eeb147735d6e8e0e9c9ca9bab25021670ad1d6705b' 
  AND token = 'Yqy51Nc23Se+Wxyqegs3I7rkTy2lphcd8Drbv8BMMv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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