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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bad6b84219c68367deb812a1b1707e00137842f1fec6f5f038c0e5142105b677' 
  AND token = 'Ck4p71MykzzCTWjI+V4scA4A0FZ4bx1W1o3kTcsFwEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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