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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb5822c9784c4714d8a3906a515d93a57f4e75b191ba70afb72a27471cfdf715' 
  AND token = 'P9/z/hy85ejEiAvRBt+bG/QM82DZOlNNWey33+/NI6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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