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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3d4b3d332953f0a9048274a50319c5ced9c6df9f7cd6639d0bb6fc2558793eb' 
  AND token = 'mW9FN+3C2aIxmpylnE03VSkUnQdfsDOsZ1RK/Fz0mx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00091

JSON explain

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